You are massively mixing things up. Water boils/evaporates off from oil based fluids in normal operation. Hydraulic fluid additives don't suck up water like br

You are massively mixing things up. Water boils/evaporates off from oil based fluids in normal operation. Hydraulic fluid additives don't suck up water like brake fluid, they just mix with it if present, and they can't mix with all that much. If these first two things weren't true it would have huge implications for the design of all sorts of things. If hydraulic fluid could mix with a lot of water we wouldn't be reading this story. I assume these jets use skydrol. I'm only casually familiar with it but unaware of it having special water related properties that differ from normal petroleum products. Glycols are a different story.